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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47e67712b88607dab4c5905741025b51718f07b5b481e46453e48eeb3b1b1a88' 
  AND token = 'qxBHHXo9QppxeHv4ktyyjDEmywAxCwtYim1zZpV+Ip0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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