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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85fbb38cf6e6919a2f5ee3b6e61210af9d91c6d1dbc26d57f5aa7e488aac7db8' 
  AND token = '49/L/F4wY9q6mAaMFzrYyb0TMMkPBHADlO3W6sv0ZmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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