Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9952c7bd6eb3ed52418e9dc151c139fbfe2be517ece2bd5060002b57fabfb192' 
  AND token = 'mEnlvDgUMyj9NU3reayGTpZaordQ/rdw209LR2ONKzM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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