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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94eecb032a261d26a332a89cec8d1513acb5a74b3b7d40289d8b466e1b0b8264' 
  AND token = 'z3g3O19WDJ72rl9cs8QsRrum6gl9OdRV28jodUD0UB0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}