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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1424189b08b7a93525a0b1b7690b5e227ee8125d949c0bce3fe247b1e03f5f7a' 
  AND token = 'j3lbCxunep+YMZTOJuq26SUQ2yam43geuLpwuFuIJ1M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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