SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a6b17c8e1ec98eab2289457f40dfa9e024f523ca693bedd76876831904aa71e' 
  AND token = '+CPJPT35sTiRZoEz86Vyq1NShLnxPK/vlBXu+xoQ/Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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