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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '78b90ec84db0146c57c63b573526393018f130a4c1309bea22610f82e2eead9c' 
  AND token = 'SY46kBjlcWe9wWl15nZB6QHVIMKtLf/S2DFe6S9EH2Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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