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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c95e924fa252689a3523cc1c7b2383786b3b586759493ec4b3695cc9e455ee93' 
  AND token = 'T34/Xwfg5w5YXPXQ+wAMEmaUj4dfvSFwekXpcLVfKBM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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