Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79a47aa2dd4c42999f851e64439460855f96d80ead39e49e81a586547a205476' 
  AND token = 'PExyDUh0W8fq5xNCrTPsjdcClwJvfcmPAnTlIHl+wYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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