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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a61bb0977ba693f0ef2fdb4762eae2080409d0336cd20f65ffa5b6ed6ce73f4' 
  AND token = 'NpPnX1CZdF7nJoekGMQxMIOaz22c2LECJ4J4/8qi894=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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