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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6b96d5803fc2dd98d2177f39773b5793460c45c94e28900c60e09a862e360206' 
  AND token = 'LBHrq8MKg5ReUabJuM+b1lQsf5QHCth9Jgm9OLU1HYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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