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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa91495b6bdb6f96a1672e7c48589b7a08a2af4f79be80392fa696f08b5ab0cd' 
  AND token = 'xdY+ppgEw2Inlo1kfVuRoh6RgOdLy6rVMGWB79KGGZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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