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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92349806a8155de99da0dc64a55c6790e285bb8a5068d15d35b0186fc71133bc' 
  AND token = 'ood0UiNUt6yTaiHCLqN/4kK8k/gzDRQmZ3AL/800xl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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