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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a62aae2d8d773d1100f41e120c6b9419fd935c6589aa168fdd77c1656c5922d5' 
  AND token = 'k7gy9ZxIIqbQMTWx2acv1k5FRU1qwYDF0H+yTMrKlJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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