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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1374cb85af9324a74e7e92c5473af55d36e9e6f7f9c6990d239c58aeeced004b' 
  AND token = 'dkQ0zPYVnEiDkUZczFlLoL66Io89LexVpnVvbOA8AFk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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