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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd21db95dd60ad943d9aac8e244cd8bc6ebda388efc83d6b3eda0dd0d916d551c' 
  AND token = 'AZvWhOtVs+/9JngGHwKshvchmEtPtnj1p43lw+yakCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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