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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '908a832c6eb7b6f88a7e86bc5ebd2b7848e34bd2703554886813c3cd24ecc22d' 
  AND token = 'yTf2Rc1asddr/DV3zUewoPg0YOzN9KqnwqSUm3rywP8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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