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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad6f1353cfc466765f919b533e8875adb0235aa4ddb87db9d259f0ed4db54a3b' 
  AND token = '9oE7IWMbPObp0IftWJTuUJg1b+LPnZGGgXpgIi/w/L8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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