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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b52d9117212ec80ebadd23a2daf7818a0bb2c4dfb77049c4c20dcfc3ca282c0' 
  AND token = '7Eztcz0vWd3fjnOo3DOESNOlUe2offHS3QY3msi3BHU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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