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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd90e44af6cc0bdd54b5e5306fea822b780b5eb6a3ef9e38892cf7e91e777e942' 
  AND token = 'QHQxjFQKtYNltfH7e/Bqef+wjprlMqnQLdHG0ccRkw0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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