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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b399a55a6833b71ef13f45c94ce13f5c51acf2a7ec9c253da948c0f391fe7384' 
  AND token = 'xTvbUGUDIF2/SUCTnga0fQxUYOhtKQSTVixvVvx/tDU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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