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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a517050cb2dc9edbead181aae9337639dbb9b279ce3e5ab541665ef041295a8e' 
  AND token = 'ZJdZDxrPwEY0z9Xfgd7eY+nV3CeKCOfqc4l2fmqUdMc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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