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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd073bd17fbfb4b922ef461df2b7f5c537a1ca88a05281859e664b9a5a1c290c' 
  AND token = 'sYu3Hrm7QXG6reeYMHURmPZ6Egnka1G6bF5RSJ58/1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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