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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '334ad2d957dc9ba2d2d1fb6452dc7da7e30892a87c34b154b3f73aa978b3b46a' 
  AND token = 'VOdXeybPcdoNkJ+QS3wtwazMxKXK8W3Z3EXHtXJVaOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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