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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3750dec7e23a0841549ed70a7c239fa96200e0ff319615851a8363dfc81a5cba' 
  AND token = 'piRdIqrRVsd9gX2f7t9b6CTCIyJfS0X0iMWM8USgklw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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