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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd674a69bed9aa97a21e92cbc5c9db68a684e067c3d6cb7f824307a918892cde7' 
  AND token = 'WMhPR0C/jIFROvaQoZ3LA6e8Dr4v57Wz8TqpNeqdJFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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