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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1638be67fd317efe4d648648aa4580aba5e64e4763e29bd6b8fd992260f75ed' 
  AND token = 'tUi//HtmHw6aiFdADNsd14y7iSty8ANG1XNZmmBDYEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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