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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33ebc49a9af3d71e51397d71d00067e25915e26330e8396011ad0d27c98212c3' 
  AND token = 'QdU+6qz7uiwd2WoFczbaV2/TMSXq3/czxE6BI9KJ1vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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