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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03ae0d09b7481f6f11b2b6a77ff042d7a3d918f9cfe3a3e507546ddab0df963c' 
  AND token = 'Rmxl4W7/Zuw9z1xzdGo+fxGCHhi/7lddgdU/HVI+hk8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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