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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd36ea9eb0a5d9d3f05a6dddfbc5821d46faed82dae00a526c464838cad9b431d' 
  AND token = 'L76J8cPKdA3I+IUy1rqrri8Y9U6XIOg/BzyASsZa8jg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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