SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f06ef22da9f6b099233f9136a919b13a0bc773a0617875dad28d16355c6b617' 
  AND token = 'XZyMQRx4h8Tvo14DVUD8BURXbwq/TmJUOcOZKbH0uVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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