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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '502c19e565055dedb642f3afaf98f94583e0d4c6ed0ed9417041cee9b42be605' 
  AND token = 'benZPQ0sX8y0FPJ1+auHWUapFelqUwsrYZJvRzj2MWg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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