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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b39bbbad07601ffe65d0a297c9ab481b5978da4b6617fa51c9a81df7d6c0c10' 
  AND token = '2ExeVapWObTqeTT32eNm31Um5tFsi6YOLu6xROLefzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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