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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31ca21b38cd4759e8a57ecdefca675b3537613e3ef8cc882536cfb9699adb77b' 
  AND token = 'UuVapBuJ/WTzYEdhxqmCtT6SmumbT2UQ5KcIfbG2fdA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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