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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7c5553f27ef863aa0d7f03875bd623fa7863d9c96fca39fce453947e13efe4' 
  AND token = '8R39cwytWfH5t8dDbyXAFluYqCBo5Ct9yJ4R78I1zkw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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