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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e396513c9f8f72506e87ecee5f66a885bebdff9642ee7c83d94c93f44b9eb06' 
  AND token = 'kw9dQFIZf47dIY2uz60yeIUYOQDixvNU8c/n9ysU884=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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