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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b67aa026a8e4d98228741d9cd48ea24dd3346e0b5a427bc879e09031c0d253fe' 
  AND token = 'cw2UGTVc/tZU+VZrzPkdr5zHYZDggArY/6LCafHxUa8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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