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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcdc430bf8f893156f0df775ba85a001418519e9fe98a8f7e4c28d58c9deb7c2' 
  AND token = 's1yVYIauAh99oOfIUl60akFvNQApYUEiX4tH5VOCyxQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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