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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b57c51216b28444a52ec1f36c1f42839cff0100f821df44a3f27d3e820cdce' 
  AND token = 'bU/IHUAQ9xpg5MYe0eP9cVf1I9nCWfNHPzyMOnxq31o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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