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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a54b1395f4dc9118d05f4f055a14ac2ea13750e308059bc96b234f6e3f209ae' 
  AND token = 'sOO4yjpG7T5N4EZHr8pPWfiS/V9epunFu35aOETbaro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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