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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ee9248ef18fbf8ea6a2d1c38f027fb6fd689b057beafa7b910211a30749117' 
  AND token = 'XlPJ+jCZ9gIX6Yo5Ab1MIZ77CA9lla62lc7bYhmQ5c8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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