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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61a66159c6dd6b7e6afd9a739903f51eb3340d36ed6348b7761025fe955f9169' 
  AND token = 'LwTsW20ku06Pg9lSrFjVCbfDJ3/aj1JrTzVmmN9Q3A0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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