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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd9e1e62c54ce4f1420d318f451d7c6400e00b26bcc0f90d5a781154d9b468e1' 
  AND token = '1GwIZf4RkX2ThVnyzGJ2gSl0+tlFe3FJDzWj2Agiza8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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