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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e30b4fef0a813642e429d02e820fc3070c68497616a68679944d16d9f009e7c' 
  AND token = 'CsZa1cmDFyDJx36tV/FT+XVZjd/9bFE9P2A2r9jdW30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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