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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c8c0d5362033c1368d00cbef148515193520214f39b6a174169c0dc031d583cb' 
  AND token = '4t4O14FthdEixhbfRXinrAbM1pX/6b8M37UynK4R+7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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