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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6dcc51060b5c6dec45aa9b09b423993ee0b26ec9d20d0a20e8c3411ea7181e3' 
  AND token = 'RwxVwtQl6H+1Hdsf6EcFjgRv8kpxRSgZhCmB9Y4vG+A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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