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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c3ce87d44e4367f2adc865172298ad42ef478c2a3c14870d4c64267ce581ae7a' 
  AND token = '0Qr5pubrcyDU6FSW+zFYqRpHt0hCshm6s2SHzZKp41o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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