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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fc490eb1dd8577d0c62d60e8fcbfc597b0981f4e977dfd56fd028dc4c9ec852' 
  AND token = 'j05JPlXEQf1wxh51m6Zu6dE2k70emu+tDfbi1WLZoQI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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