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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8b8b5a406725a19a923991b98309f19a867b5f94974b1b93d6163b4aac015c' 
  AND token = 'j2za4cqJCExzgiKGdjXKIhqu7wN8O9X7oGkDF5FtqdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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