SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2fa4948d9a178d8c63b952b505b87245a3891df8bfc7650e44f0a6b1d1ba3901' 
  AND token = 'nCfGdhtf6sl2vcRukR69jjzFaSCjX6lMzhnHOYy7Biw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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