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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13033081f9cc370557d2d82d8256d4ace31f75ef0a5f56af4dd7a680c939dc28' 
  AND token = 'bEUkeQISoCcWm8CE4Uhc9ObDyhsV0NvXhVvI/Ql64qo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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