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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54a28c5d6a49a4008cc326f365a7ed8c569475642b8ceb5ebaf3c6327dc6e0cd' 
  AND token = 'itwH/DPqrcekKpUxXqU2Lha1P3258n5wxEW6LoJ8aWQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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