SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07b37418799a62be1ccdda0e5aabe740cd82005c3488195bdfec9e758d9c93df' 
  AND token = 'C3uJ8CuTuFv0+ClcoGOVequPfSYKWtWhwNJgRrQG/M4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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