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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8979b736961d800bb2e04790eae7dc6a6725912f56ca63c0c08898d0a75ebe3d' 
  AND token = 'p9yvJ+Coh3FkWJKBKHR64YxBSf5VbOtoMAnH6lcrhNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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