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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd6c951de208c1d11e4a13789191bd4bdda3708b0e6282c9c860d5697fa788fa' 
  AND token = 'iCy20izWT9Ke3cGF72OdXzQ8FLEAGKrSV79ppqHz54g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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