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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '28dee7b488c7961cab4db22cbe3a3d20ec4518fd3859bf54df899eb0059c94cc' 
  AND token = 'mZ/x5yInwIyTnGp9+PFItU4wd4gG51nx6/NI7In3050=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00051

JSON explain

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