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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71efa06cc6aec9602eb435a350f9a84727b4f8cd0c0d4cd5ef08e8507f09865f' 
  AND token = 'c8FVR9oNx28s5am01y0HHHjvc6FDHcSj4KsUJtv/Mh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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