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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'feec83664f2d958cf7b024b87789ebc76d09ca727790a5862c35d6640c26e6cf' 
  AND token = '414DeuRkW/DHbb9jWJfpNWQdy6jOI+hUOG0JKuFJynU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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