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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc9beef2d566ae1389ca3798864bbbf968c208592a6bbe62aa1809fa62eb48f3' 
  AND token = 'FbmyA9yRFdzlAZloPWn0y4K8aQhoD4DO3dLw/W3bQGo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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