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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07aa946291f01d7f1df9184334c85132a27ef626d0c88e5d7693fac123a6e71d' 
  AND token = '1iXmV1gnPofhFy5oIYeiptby0IcqCgbSgAXy3by8wTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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