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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a540e0527e212704b9ce5de270b89d887275ec8841122104e2437b9eeb7e40' 
  AND token = '+DcGWfOa04Yldivej0bSTWSZVD8DTJl0OTPsRPMvwSA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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