SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd169782c9e8b9c3aff34b55f2420eed7d40debf88d7553d8687a10d229f2bdb2' 
  AND token = '7bVqhmAaZCN+jMObs7poWlS5tWHWzgGmmpRFm6xRJ1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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