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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a9f129d9b04b714cba6c832e8acfcd8dea50732ce07650a51f988bb4c19f9d0' 
  AND token = '2ohdtC8slL1RT6QGRV8XTEM+lmpxrD6+F4V0dTW8XIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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