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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79eedaa002e88be554ecfac505404b620f541962c888eb8cd10201c71595c99f' 
  AND token = 'Zj7V1/iQK1QIFL7u2jAsut9uqoagTre9BGrpymlnEfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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