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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '85989d50600e29097d4d60d8ab895b758976a4351eb2bf78005c714682532400' 
  AND token = '4mivm5H6pop0679TrkDaoE45QRq+LCJc1t/vWP8xLzI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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