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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9148903e2a5473218a890a17ac15dd4bdf48d991deee0c6488be69efb348f49e' 
  AND token = 'Nq4axuEmtGJy/RJKX4ORAENZlz8AeR601USuQcaN3ag=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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