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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f356ed0fc76751b7b4da5246776b932026c4c412f93e63c96f5489a4aa392b1b' 
  AND token = 'QuAE5qZ+HsGrcWWfUkZJskCYcPumP1ys0HCGf/rEn0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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