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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9db587aaae55fb1721adbe3752778e1dcebbbcd3949762e9afea4832a4c65af9' 
  AND token = 'XJ65fGzKv8pnW1SEhXTWIxz3qH7V9pKvAUlweUiw58w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00096

JSON explain

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