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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c44ba47dc417abb7013eb54d09ca5e6062720e0d5c1b51e63fd88ac3506a295e' 
  AND token = 'Rf9AsrwPYEe3qSF5lOYMpuwOlwIl095MPyMHmeJNwk4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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