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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69f69a957fc52b495f1b0732339f4e7fea701493c4c6716c42687ba451329365' 
  AND token = 'SqcSa7xYrURtgZkNgGTmoc4N1olrfMA35iZUG9NtWLE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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