SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e007126c5c21ada854b2f87742079b2d8f78a6426b1b8531c4746e88a7296c9' 
  AND token = 'GgVcX38HpimEG+bDzUbTdJO1iwwY4BLBxPOt68jm3J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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