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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2add9ba4871c84c316ae97c949761092ea9fa3c91e3e19ec68be4dbd1019ce64' 
  AND token = 'o6iNwvnutQwY1T6xwU494iBe+ogFUd0rwpbULrs8MqI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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