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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e6734e64c28e99a07c4a5d9180eccef4d6c28f9cee726304ff5a0788517e4be' 
  AND token = 'J4dnpan9of5E7v+TKtwlxiZZNIpf6rVWh7exQZncWZ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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