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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddbc019b349a7934a389e1748c2b7f1151992b5e29ebbb9481e48b805a3c0209' 
  AND token = 'nmsbdC+QV5rE0ygMV93qPpGblcM/LvhKnBYV+34trZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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