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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0b3f11b4ede52754acd8b1d974ac25cad93e7b2863e54a9346252c599f81adb' 
  AND token = 'SdOHeDyVoiUc45HP0sQ+QIyPJddn4abe4J+QphwK5IA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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