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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8d1ddd6bc6aee148eaa84e56d2966879dc5f9b33320205e2e7e273a23c068fc5' 
  AND token = '9C8kha+DXCl/LV3WrkKf7oPBxou+iSbResHfrZYKCJE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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